Rumen trocar extricator



Sept- 23, 1 R. D. HOFFMAN El'AL RUMEN' TROCAR EXTRICATOR Filed July 10,1956 Fig.2

FORE/G/V 55 RUME/V Ray 0. Ho'ffma5 Vance A. Car/son INVENTORS.

non W 3 M1 United States Patent D" RUMEN TROCAR EXTRICATOR Roy D.Hoffman, Bedford, and Vance A. Carlson, Kittanning, Pa.

Application July 10, 1956, Serial No. 596,964

3 Claims. (Cl. 128-356) The present invention relates to a structurallynew instrument, called an extricator, and used in conjunction with arumen trocar and utilizing a technique and reliable method steps ofremoving magnetic foreign bodies from the rumen and recticulum of abovine, a cow, for example.

In reducing the concept to practice there has been evolved and producedan instrument which is simple in construction as well as in operation,is less costly than present-day expensive rumenotony, minimizes surgicalshock, is manipulable and safe and practical for accessible use in allportions of the rumen and reticulum and is otherwise such, when usedaccording to the technique recommended, that it reduces after-care ofthe cow to an appreciable minimum.

It is a matter of common knowledge that a permanent magnet may be usedin exploratory and extricating practices where, from a remote point ofcontrol and operation, magnetizable bodies, such as nails, wire and thelike may be dislodged and recovered, as it were. It is necessary, ofcourse, to successfully and satisfactorily introduce the magnet into theintended areas of the cows stomach. Keeping this in mind it is anobjective in the instant revelation to provide and utilize an extricatorinstrument which is such in construction and design that it issusceptible of being dropped into the dorsal part of the rumen of thefirst stomach of the cow making it then possible to slide the same downalong the existing partition for reception in the so-called groove ofthe second stomach. To this end the instrument which is the subjectmatter of the instant invention is virtually fool-proof in that it canbe carried along the dorsal wall and slid over the edge of thepartition. With similarly performing instruments now on the market it isnecessary to pass them into the mouth and this involves utilizing aflexible hose-like tube which must be flexed by means of a cord hoping,of course, that the leading end with the magnet means thereon will findits way into the second stomach. In the instant situation the operatorhas at his command an instrument of appropriate construction which giveshim definite control in rotation and making it possible to not onlyreadily insert the instrument but to remove it without any injuriouseffect. What is also important is that the construction here utilizes aninstrument which makes it' possible to pass the magnet into the anatomywithout endangering vomiting and promoting pneumonia, as frequentlyoccurs, with the marketed instruments which require piloting and passingthe tube, magnet and other parts via the mouth and throat into thestomach.

One aspect of the invention pertains, briefly recited, to a structuralcombination characterized by a rumen trocar embodying a cannula and aninsertable and removable stilette cooperable with said cannula andthrough the medium of which the required trocarizing procedure isundertaken and completed and which results in providing an incision inthe para lumbar fossa on the left side of a cow, said stilette beingadapted to be wholly detached from the cannula so that the cannula thenstays put and functions as an adapter and bushes the ice incision, apermanent magnet, remote exteriorly controlled means connected with andfor actuating and manipulating said magnet within limits of the areaunder exploration, and means supported by and operable in said cannulaand which, in turn, supports, and pilots said first named means andotherwise makes it possible to aptly and safely carry out the intendedtechnique and to efficaciously extricate the foreign bodies.

As before pointed out the invention involves not only the physical ormechanical equipment above touched upon but also the method steps whichare capable of being resorted to and relied upon because of the deviceswhich have been herein perfected for use. That is to say, novelty isalso predicated upon a method or technique of removing magnetizablebodies from the rumen and reticulum of a cow which invokes a generallywell known trocarizing procedure and wherein the sequential stepspursued involve the steps of making a prescribed incision in the paralumbar fossa on the left side of the cow, penetrating the rumen bythrusting a one-inch rumenotony trocar into the same by way of saidincision, removing the stilette from the cannula and bushing theincision with the cannula so that the cannula constitutes an adapter,and then passing a permanent magnetequipped extricator through theadapter so that the leading end of the adapter may be shoved downwardlyand so that the extricator, as an entity lies in a plane almosthorizontal with the axis of the cow, then moving the extricator forward,following the dorsal wall of the rumen until the magnet on the leadingend comes to rest in the recticulum.

Other and more specific objects, features and advantages will becomemore readily apparent from the following description and theaccompanying sheet of illustrative, but not restrictive, drawings.

In the drawings wherein like numerals are employed to designate likeparts throughout the views:

Fig. 1 is a fragmentary perspective view of the rear portion of a cowshowing the cows stomach broken away and disclosing the areas involvedand showing the extricator in position and the manner in which themaneuverable permanent magnet is susceptible of use in picking up andcausing the metallic or magnetizable bodies to adhere thereto;

Fig. 2 is a view like Fig. 1 showing how by reason of extra mechanicalfacilities it is possible to bring about a sweeping and dragging actionof the projectible, retractible and slidable magnet in the rumen, theindicating arrows being relied upon to explain the general mode of useand operation;

Fig. 3 is a view in section and elevation ofthe extricator, the viewbeing foreshortened but ample to show all of the essential structuraldetails;

Fig. 4- is an enlarged section on the line 44 of Fig. 3, looking in thedirection of the arrows;

Fig. 5 is a fragmentary view in section and elevation showing thecannula lining or bushing the incision and illustrating the intermediateportion of the sheath or tube located therein for use;

Fig. 6 is a perspective view showing the step which is followed afterthe incision is made, that is where the pointed end of the stiletteforcibly shoved through the incision to penetrate the rumen at thedesired place and angle;

Fig. 7 is a perspective view showing the cannula in place with thestilette removed; and

Fig. 8 is a perspective view of the leading end portion of thereciprocable and turnable push-pull magnetequipped rod.

As is evident the extricator or instrument is characterized by a hollowtube of rigid non-magnetic material such as copper, brass or aluminumwhich is some 42 "A inches long, one-half inch in diameter, said tubebeing denoted by the numeral and also serving as a sheath. Inwardly orforwardly of the proximal end 12 is a lateral hand-grip 14 which is forthe convenience in manipulating the construction as seen especially inFigs. 1 and 2. The distal or leading end portion is slightly enlarged toprovide a socket member as at 16 for the adjacent end portion 18 of asuitably constructed Alnico permanent magnet 20. This is connected by auniversal joint to the adjacent end of a rigid link 22. Morespecifically the inner end of the magnet has an eye 24 joined to an eye26 on the link making a simple universal point susceptible of use in theways depicted in Figs. 1 and 2. The link 22 is hingedly connected as at28 to the end of a relatively long push-pull rod 30. On the outer end ofthe pushpull rod are additional relatively short rigid linearly spacedlinks 32 and 34 and these are hingedly connected with each other as at36 with the links 32 hingedly connected at 38 to the cooperating endportion of the push-pull rod 30. Thus the over-all rod structure may betreated as jointed rod means for reciprocating and oscillating thepermanent magnet, said rod means being essentially sheathed in thepiloting and applicator tube 10. The rumen trocar comprises a cannula 40having a collar or flange 42 at the outer end and serving as a bushingfor the pointed stilette 44 equipped with a handgrip 46. The incision 48is formed in the area 50 and the cannula functions in the manner shownin Figs. 5, 6 and 7 as is obvious.

The instrument is used in the following manner: The

standard procedure for trocarizing the rumen is used. A 2 /2 inchincision is made in the para lumbar fossa on the left side of the cow.Through this incision a one inch runicnotony trocar is thrustpenetrating the rumen. The stilette is removed from cannula and theabove described instrument is inserted into the cannula a shortdistance. The end of the extricator is then shoved downwardly so thatthe instrument lies in a plane almost horizontal with the axis of thecow. The extricator is then moved forward following the dorsal wall ofthe rumen until it comes to rest in the reticulum. This position can beascertained by slight pressure forward on v the instrument and adefinite pulsation of the heart will be felt. In this position thejointed rod is shoved forward in the tube so that the swivel is just outthe end. The instrument is left in this position in the recticulum for afew moments. Then, the instrument is moved laterally as far as it willgo in both directions. The magnet is then drawn in to the head of thetube and the extricator withdrawn through the cannula. will be clingingto the magnet. In some animals the lateral motion of the instrument isnot sufficient to reach the lateral wall of the reticulum so that theinstrument is used as illustrated in Fig. 2. By manipulating the magnetsweeps the wall laterally in the reticulum. After all metal has beenremoved from the reticulum, the extricator can be placed in anterior sacand also sweeps the floor of the rumen for potential offenders.

It is believed that the various views of the drawing taken inconjunction with the specification and description, plus the recitationof the objectives will enable persons skilled in this line of endeavorto understand the method steps which are used in carrying out thetechnique as required and the construction and mode of use of theinstrumentality referred to generally as the extricator. In thesecircumstances a more extended description is believed to be unnecessary.

Magnetic foreign bodies Insofar as the instrument itself is concernedchanges in shape, size, material and rearrangement of parts may beresorted to in actual practice without departing from the spirit of theinvention or the scope of the subjoined claims.

What is claimed as new is as follows:

1. For use in conjunction with a rumen trocar, an extricator formagnetic foreign bodies comprising an elongated rigid non-magneticreach-tube having open distal and proximal ends and provided adjacentthe proximal end with a lateral hand-grip, a permanent magnet cooperablewith said distal end, said distal end having an enlarged bell-liketerminal providing a socket, the adjacent end of said magnet beingadapted to telescope into said socket, a push-pull rod of a lengthslightly less than the length of said tube and sheathed in said tube andslidable and rotatable therein, a link hinged to the leading end of saidrod, said magnet being connected to the forward end of said link by wayof a universal joint, and additional links hingedly joined to each otherand the rearward 0r outward end of said rod.

2. For use in conjunction with a rumen trocar, an extricator formagnetic foreign bodies comprising an elongated rigid non-magneticreach-tube having open distal and proximal ends and provided adjacentthe proximal end with a lateral handgrip, a magnet means cooperable withsaid distal end, and means for operating said magnet means sheathed inthe bore of said tube and reciprocable and turnable in said bore, saidoperating means comprising an elongated push-pull rod, and a linkhingedly mounted on the leading end of said rod, said magnet beingconnected to the forward end of said link by way of a universal joint.

3. For use in removing and extricating magnetic foreign bodies, such asnails and the like, from a bovine rumen and reticulum with the aid of arumen trocar embodying a cannula and through the medium of which thedesired trocarizing procedure may be undertaken and completed and whichinvolves providing an incision in the para lumbar fossa on the left sideof the cow for reception of the cannula with the cannula bushing theincision; an extricator for use in conjunction with said trocarcomprising an elongated rigid non-magnetic tube of prerequisite lengthhaving open distal and proximal ends and provided adjacent the proximalends with handle means, a magnet cooperable with said distal end, theend of said magnet adjacent to said tube being adapted to telescope intothe cooperating adjacent end of the tube, a push-pull rod of a lengthslightly less than the over-all length of said tube and sheathed in saidtube and slidable as well as rotatable therein, a link hinged to theleading end of said rod, said magnet being connected to the forward endof said link by way of a universal joint,

. and additional links hingedly joined to each other and also joinedoperatively to the proximal end portion of said rod.

References Cited in the file of this patent UNITED STATES PATENTS1,902,418 Pilgrim Mar. 21, 1933 2,095,976 Foreman Oct. 19, 19372,583,937 Fossati Jan. 29, 1952 2,751,912 Christoni June 26, 19562,753,869 Mufily July 10, 1956

